Why deposits of longitudinal dunes are rarely recognized in the geologic record
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Abstract
Dunes that are morphologically of linear type, many of which are probably of longitudinal type in a morphodynamic sense, are common in modern deserts, but their deposits are rarely identified in aeolian sandstones. One reason for non-recognition of such dunes is that they can migrate laterally when they are not exactly parallel to the long-term sand-transport direction, thereby depositing cross-strata that have unimodal cross-bed dip directions and consequently resemble deposits of transverse dunes. Dune-parallel components of sand transport can be recognized in ancient aeolian sands by examining compound cross-bedding formed by small dunes that migrated across the lee slopes of large dunes and documenting that the small dunes migrated with a component in a preferred along-crest direction over the large dunes.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Why deposits of longitudinal dunes are rarely recognized in the geologic record |
| Series title | Sedimentology |
| DOI | 10.1111/j.1365-3091.1985.tb00498.x |
| Volume | 32 |
| Issue | 1 |
| Year Published | 1985 |
| Language | English |
| Publisher | Wiley |
| Contributing office(s) | Coastal and Marine Geology Program |
| Description | 11 p. |
| First page | 147 |
| Last page | 157 |
| Online Only (Y/N) | N |
| Additional Online Files (Y/N) | N |
| Google Analytic Metrics | Metrics page |